by defeating Los Payasos (Coco Amarillo, Coco Azul, Coco Negro, and Coco Rojo) in the finals to win the Atómicos title. Over the following months Los Vipers began a storyline feud with another group called Los Vatos Locos, which at the time consisted of Charly Manson, May Flowers, Nygma, and Picudo. On February 14, 1999, Los Vatos Locos defeated Los Vipers to win the Atómicos championship. Los Vipers won the title a second time on September 17, 1999, when they defeated Los Junior Atómicos (Blue Demon Jr., La Parka Jr., Mascara Sagrada Jr. and Perro Aguayo Jr.). Los Vatos Locos managed to end Los Vipers second reign only three months later as they defeated Psicosis and partners on the undercard of the 1999 Guerra de Titanes show. Los Vipers regained the Atómicos title on April 15, 2000. effectively ending the storyline with Los Vatos Locos. Los Vipers reigned as Atómicos champions for over a year, until they were surprisingly upset by a little-known group called Los Regio Guapos (Hator, Monje Negro, Jr., Potro, Jr.. and Tigre Universitario) on August 19, 2001. Los Regio Guapos only held the title for under two months before Los Vipers regained the title and began their fourth reign with the Atómicos title. Their fourth reign also turned out to be the last reign for Los Vipers, ending on November 23, 2001, as a new version of Los Vatos Locos (Espiritu, Nygma, Picudo and Silver Cat) defeated them in one of the featured matches of the 2001 Guerra de Titanes. Following the loss both Maniaco and Mosco de la Merced began appearing less and less for AAA. On August 13, 2002, Psicosis won his first singles championship as he defeated Pimpinela Escarlata to win the Mexican National Middleweight Championship. His reign as Middleweight champion was characterized by long periods where the title was not even defended, stretching his title reign out for almost three years. During this time period Psicosis turned técnico as he joined "The Mexican Powers" along with Juventud Guerrera, Crazy Boy, and Joe Líder. In early 2005 the original Psicosis returned to AAA and immediately began a storyline with Psicosis II over the rights to the name. The storyline included a steel cage match that took place at Triplemanía XIII, but ended in a no contest as Psicosis II's former partner Histeria interfered in the match when he attacked both wrestlers. Subsequently, the